Question about axed B:TAS episode

About the Catwoman/Black Canary episode that was planned, but ultimately axed because of the producers' desire to not use Robin in the episode... Was this the episode that ultimately became "Catwalk"? It can't be a coincidence that we ended up with an episode of The Adventures of Batman and Robin that was a solo Batman story involving Catwoman amongst lots of episodes which did feature Robin. Every episode from "House and Garden" onwards had Robin, except "Catwalk". But if that was the one which was originally meant to be the Black Canary episode, then why did Robin end up not appearing in it regardless? Wasn't it mandated that he had to be in it...?